首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1979640篇
  免费   153379篇
  国内免费   3571篇
耳鼻咽喉   29181篇
儿科学   64668篇
妇产科学   55397篇
基础医学   283360篇
口腔科学   55369篇
临床医学   172811篇
内科学   387268篇
皮肤病学   42078篇
神经病学   157490篇
特种医学   79056篇
外国民族医学   825篇
外科学   306285篇
综合类   47954篇
现状与发展   3篇
一般理论   600篇
预防医学   151952篇
眼科学   45808篇
药学   147500篇
  2篇
中国医学   3789篇
肿瘤学   105194篇
  2018年   19027篇
  2016年   16143篇
  2015年   18527篇
  2014年   26212篇
  2013年   40070篇
  2012年   54592篇
  2011年   57558篇
  2010年   34273篇
  2009年   32402篇
  2008年   54957篇
  2007年   59318篇
  2006年   59410篇
  2005年   58070篇
  2004年   56938篇
  2003年   55141篇
  2002年   53734篇
  2001年   90545篇
  2000年   93530篇
  1999年   79361篇
  1998年   22581篇
  1997年   20550篇
  1996年   20697篇
  1995年   19591篇
  1994年   18704篇
  1993年   17453篇
  1992年   64691篇
  1991年   63266篇
  1990年   61689篇
  1989年   59073篇
  1988年   54839篇
  1987年   53998篇
  1986年   50612篇
  1985年   48852篇
  1984年   37169篇
  1983年   31515篇
  1982年   18942篇
  1981年   17376篇
  1980年   15876篇
  1979年   35176篇
  1978年   24886篇
  1977年   21052篇
  1976年   19551篇
  1975年   21304篇
  1974年   25425篇
  1973年   24522篇
  1972年   22941篇
  1971年   21025篇
  1970年   19914篇
  1969年   18734篇
  1968年   16963篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
We report our experience of eight cases of isolated full thickness burns of the penis. Early excision of burns of the penile shaft and repair with a preputial flap or mesh split skin graft produces excellent results, with a reduction in complications and an early re-establishment of sexual function. Conservative treatment of burns of the glans, on the other hand, is appropriate and results in minimal scarring.  相似文献   
83.
The use of additional epidural sympathetic block during and after microvascular surgery in the lower extremities to prevent vasospasm is generally agreed on. However, a significant fall in the perfusion rate of the transplants was seen after application of bupivacaine (Marcain) via the epidural catheter. This effect has, to our knowledge, not been described before and is probably caused by the sympathectomy effect of this type of analgesia.  相似文献   
84.
The present study demonstrates that alcohol-induced memory impairment can be attenuated by pretreatment with an oral tryptophan supplementation. These results provide support for the role of a brain serotonin deficit in this impairment and highlight the impact a dietary manipulation can have on a complex behavioral process.  相似文献   
85.
The Dundee Memory Clinic was established in 1991. This paper reviews the diagnosis of the first 150 attenders and compares the findings with those of other memory clinics.  相似文献   
86.
Macrophage NRAMP1 and its role in resistance to microbial infections   总被引:12,自引:0,他引:12  
  相似文献   
87.
88.
Membrane-bound CD14 acts as a receptor for lipopolysaccharide (LPS) on monocytes/macrophages and neutrophils. Studies have suggested that the activation of monocytes/macrophages by the binding of LPS to membrane-bound CD14 may require the association of a signal-transducing molecule with membrane-bound CD14. The observation that non-CD14 expressing cells, such as endothelial cells, can nevertheless be activated by a complex of LPS and a soluble form of CD14 (sCD14) suggests that the receptor for this complex may be identical to the signal transducing molecule associated with membrane-bound CD14. The studies described show that two CD14-specific MoAb are able to block the LPS-induced activation of endothelial cells but do not affect the response of monocytes to LPS. This suggests that the interaction of the sCD14:LPS complex with endothelial cells is distinct from the interaction of membrane-bound CD14 with its putative signal-transducing molecule.  相似文献   
89.
Most prosthetic joint infections (PJI) are due to wound contamination at the time of surgery. Some infections occur due to the hematogenous spread of bacteria from distant sites of infection. A review of the literature fails to associate PJI with transient bacteremias from invasive dental procedures. Several authors have described conditions which, they believe, render patients with prosthetic joints more at risk for infection. Prosthetic joint patients with these "high risk" conditions have the same types of infecting organisms as other patients with PJI. This indicates that the infecting bacteria are from wound contamination or distant sites of infection and not related to dental procedure bacteremias. Based on this review, antibiotic prophylaxis is not indicated for patients with prosthetic joints when receiving invasive dental procedures, since there is no proven benefit and there are known risks involved with the use of antibiotics. However, the American Dental Association (ADA) and the American Academy of Orthopaedic Surgeons (AAOS), in an advisory statement, suggest prophylaxis for "high risk" patients. The ADA and AAOS recommend a single dose of amoxicillin, cephradine, or clindamycin when prophylaxis is selected. The dentist is ultimately responsible for making treatment recommendations for his or her patients.  相似文献   
90.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号